[ Tenses ]
I ____ along the street when I suddenly heard footsteps behind me.
A. was walking
B. am walking
C. walk
D. walked

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A. must
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Grammar for TOEFL › View
Hospital committees _____ spent weeks agonizing over which artificial kidney candidate would receive the treatments now find that the decision is out of their hands.
A. once
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C. have
D. once had
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Adverbs › View
Use an adverb of frequency in a sentence.
A. I rarely eat breakfast.
B. I sometimes read books at night.
C. I walk every day in the morning.
D. I usually go for a walk in the evening.
